SHOP MANUAL
Engine
Ch 1 page 84
Turbocharger
The purpose of the turbocharger is to
increase the volume of air entering the
engine’s cylinders. With more air the engine
can burn more fuel and so develop more
power and achieve cleaner com bustion than
a corresponding engine without supercharg-
ing.
The turbocharger is driven by the engine’s
exhaust gases and consists of a turbine part
and a compressor part. The compressor part
compresses the engine’s intake air.
The compressor wheel is mounted on the
same shaft as the turbine wheel. This shaft
runs in a bear ing housing between the com-
pressor and turbine.
Higher power output from the engine gives
more exhaust fumes and the increased
exhaust means that the turbine wheel and
therefore the compres sor wheel rotate faster.
In this way, the quantity of air is adapted to
engine requirements without any special
control devices.
The turbocharger wheel rotates extremely
fast. At full power, speed is about 100,000
rpm. At the same time, the temperature
on the exhaust side of the turbine wheel is
above 600°C.
This makes big demands on the rotating
parts in regard to balance, cooling and lubri-
cation.
The shaft is mounted in two bushings which
rotate freely in the bearing housing. The
bearing housing seals for the turbine and
compressor consist of seals which are simi-
lar to piston rings.
4
3
2
1
5
6
7
8
Figure 161
Figure 162
To Next Page
Loading...